Não informado. Data book electronic information series. Derivation and Tabulation Associates.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Data Book Electronic Information Series. San Diego, Calif: Derivation and Tabulation Associates.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Data Book Electronic Information Series. Derivation and Tabulation Associates.
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